Schorman beat you to it a while back - I can’t find a dedicated thread for it, but it’s an offshoot of this project:
https://originaltrilogy.com/topic/schormans-HDTV-Star-Wars-Saga-Preservation/id/16702/page/1
He just recently released a v2.0 of the HDTV versions, and has said he intends to release a v2.0 of his theatrical ROTS using the updated video once he finishes with some tweaks to the audio.